If the side of the square is 0.75 cm, then the perimeter is 35 millimeters.

To check this judgment, you first need to express centimeters in millimeters. This is necessary to simplify further calculations. To express centimeters in millimeters, you need to multiply the number of centimeters by 10. We get:

0.75 * 10 = 7.5 (mm);

Now let’s remember the formula for the perimeter of a square. It looks like this:

P = 4 * a, where P is the perimeter; a – side of the square.

Now let’s plug in the values ​​into the formula.

P = 4 * 7.5 = 30 (mm)

The condition states that the perimeter is 35 millimeters. This judgment is not true, since we ourselves have learned the correct answer.

Answer: the perimeter is 30 mm.